> If you download firefox as a tar and put it in /usr/local, you can then 
> change the owner of that folder to something different from the user you 
> normally use with firefox. So for example set up a user called firefox 
> and then: 
> 
> chown -R firefox:users /usr/local/firefox 
> 
> This prevents firefox from updating itself when you are not logged in as 
> firefox. 
> 
> You need to link the executable into /usr/local/bin 
> 
> ln -s /usr/local/firefox/firefox /usr/local/bin/firefox

Interesting idea.  I've only got a couple of different users set up (various 
levels of security - one for usage and one for maintenance/repairs, besides 
actual security software), and I wonder how the install I have now would work 
if I set up a new low-level user and just changed the ownership of FF.  That 
way it would help to isolate the browser from everything else and create 
another layer of security.  We do have a skilled hacker in the area (he used to 
get into our router through the cable, turn on the wireless and removed all 
security from it, and was probably using it for games - huge downloads of data 
- but our local 'finest', like usual, refused to do anything about it).
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